Detailed description
Triangle PQR dash, PQ = 9, PR dash = 7. Angle PQR dash = 45 degrees. Triangle PQR, PQ = 9, PR = 7. Angle ABC = 45 degrees. Angle PR dash Q = theta dash and angle PRQ = theta.
Trigonometric functions and circular measures
Triangle PQR dash, PQ = 9, PR dash = 7. Angle PQR dash = 45 degrees. Triangle PQR, PQ = 9, PR = 7. Angle ABC = 45 degrees. Angle PR dash Q = theta dash and angle PRQ = theta.